|Originally Posted By dwnforce:|
I have a RRA A4 flattop that I want to put a 24" wilson barrel on, What is the purpose of the barrel extension? Just wondering if I need to purchase anything else? feedramp etc. Thanks!
The barrel extension is the part with the locking lugs on it, make sure your barrel comes with one installed. It is not something you want to do yourself (the barrel extension).
You might need a barrel nut, delta assy, handguards unless you use FF tube (then you will need those parts depending on type) gas block and tube (with pin).
Edit for clarification.